Invariably, a street must come to a sump. In most cases, overflow is directed over the curb and down an open channel. However, in some cases, the overflow is directed over a hill in the street. As flow from a 100 year event (1% chance) event is allowed to reach two feet from the flow line, this hill could be a foot higher than the sump allowing for up to a foot of over topping. I am needing to model the hydrology through such a section. The cross slope is typically 3% and the curb is 6" tall. The slope behind the curb is typically 2%, mostly grass and a 4' sidewalk. Anyone else out there run into a similar situation?
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